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<TITLE>JavaScript Source Code 3000:  Forms:  Information Validation</TITLE>
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<META NAME="date" CONTENT="2000-09-09">
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<META NAME="author" CONTENT="JavaScript Source Code 3000">
<META NAME="section" CONTENT="Forms">
<META NAME="description" CONTENT="Test the powers of  JavaScript.  Watch as JavaScript tells you if information about you is valid or not.">

<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
function validate(){
var digits="0123456789"
var temp
if (document.testform.Name.value=="") {
alert("No Name !")
return false
}
if (document.testform.age.value=="") {
alert("Invalid Age !")
return false
}
for (var i=0;i<document.testform.age.value.length;i++){
temp=document.testform.age.value.substring(i,i+1)
if (digits.indexOf(temp)==-1){
alert("Invalid Age !")
return false
      }
   }
return true
}
// End -->
</SCRIPT>
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<b><A HREF="../index.htm" /" TARGET="_top">
Home</A> </b><img src="../img/arrow.gif" /img/arrow.gif" height=13 width=7 border=0 alt="}"> <b><A HREF="index.htm" /forms/" ><font color="#FF0000">Forms</font></A> </b>
<img src="../img/arrow.gif" /img/arrow.gif" height=13 width=7 border=0 alt="}"> <FONT COLOR="#006666">Information Validation</FONT></b></FONT><BR>
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<!-- Description --><!--content_start-->

Test the powers of  JavaScript.  Watch as JavaScript tells you if information about you is valid or not.
<br>
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<!-- Demonstration -->
<BODY>
<FORM name="testform" onSubmit="return validate()">
Name:<input type="text" size=30 name="Name">
Age:<input type="text" size=3 name="age">
<input type="submit" value="Submit">
</FORM>
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<P>
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<tr><td BGCOLOR=yellow><font FACE="helvetica,arial,geneva"><b>JavaScript Source Code 3000:  Forms:  Information Validation</b>
<p>Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Apple-s).  The script is yours!!!<br><br></font></td></tr>
<tr><td BGCOLOR=yellow ALIGN=CENTER>
<form NAME="copy">

<DIV align="center">
<input type=button value="Highlight All" onClick="javascript:this.form.txt.focus();this.form.txt.select();">&nbsp;&nbsp;&nbsp;&nbsp;
<INPUT TYPE="text" NAME="total" VALUE="Script Size:  1.16 KB  " size="24">
</DIV>

<textarea NAME="txt" ROWS=20 COLS=75 WRAP=VIRTUAL>

&lt;!-- TWO STEPS TO INSTALL INFORMATION VALIDATION:

   1.  Paste the coding into the HEAD of your HTML document
   2.  Put the last code into the BODY of your HTML document  --&gt;

&lt;!--  STEP ONE: Copy this code into the HEAD of your HTML document  --&gt;

&lt;HEAD&gt;

&lt;SCRIPT LANGUAGE="JavaScript"&gt;

&lt;! &gt;
&lt;! &gt;

&lt;!-- Begin
function validate(){
var digits="0123456789"
var temp
if (document.testform.Name.value=="") {
alert("No Name !")
return false
}
if (document.testform.age.value=="") {
alert("Invalid Age !")
return false
}
for (var i=0;i&lt;document.testform.age.value.length;i++){
temp=document.testform.age.value.substring(i,i+1)
if (digits.indexOf(temp)==-1){
alert("Invalid Age !")
return false
      }
   }
return true
}
// End --&gt;
&lt;/SCRIPT&gt;

&lt;!--  STEP TWO: Copy this code into the BODY of your HTML document  --&gt;

&lt;BODY&gt;

&lt;FORM name="testform" onSubmit="return validate()"&gt;
Name:&lt;input type="text" size=30 name="Name"&gt;
Age:&lt;input type="text" size=3 name="age"&gt;
&lt;input type="submit" value="Submit"&gt;
&lt;/FORM&gt;

 

&lt;!-- Script Size:  1.16 KB  --&gt;
</textarea><br><font FACE="helvetica,arial,geneva"></font></td></tr>

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</form>
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